Mobile device-based bandwidth throttling

ABSTRACT

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for implementing mobile device-based bandwidth throttling. In one aspect, a method includes receiving policy from a wireless carrier that specifies one or more data usage thresholds allotted by the wireless carrier for data transferred over a wireless carrier network during a predetermined period of time, determining an amount of data that has been transferred by the mobile device over the wireless carrier network during the predetermined period of time, determining that the amount exceeds one or more of the data usage thresholds, and throttling the bandwidth of a mobile device over the wireless carrier network based on determining that the amount exceeds one or more of the data usage thresholds.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional of U.S. patent application Ser. No.13/490,761, filed on Jun. 7, 2012, which is a continuation of U.S.patent application Ser. No. 13/283,159, filed on Oct. 27, 2011, whichclaims the benefit U.S. Provisional Patent Application No. 61/408,898,filed Nov. 1, 2010, all of which are incorporated herein by reference.

FIELD

The present disclosure relates to bandwidth throttling.

BACKGROUND

“Bandwidth” refers to a measure of the bit rate of data communicationresources, expressed in a number bits communicated per unit time.“Bandwidth throttling” may be used to reduce the speed at which data iscommunicated, for example to limit network congestion or to help preventa web server from crashing.

A server administrator may set a bandwidth throttling parameter to limitthe number of requests that the server responds to within a specifiedperiod of time. For example, the server may be configured to implementbandwidth throttling during periods of peak server use, to prevent theserver from crashing while attempting to respond to a large number ofdata requests. When the bandwidth throttling parameter is exceeded, theserver may queue additional data requests, or may delay processing theadditional requests until bandwidth use reaches an acceptable level.

SUMMARY

In general, one aspect of the subject matter described in thisspecification may be embodied in methods that include the actions ofimplementing bandwidth throttling by a mobile device based oninformation that is provided by a wireless carrier. In one aspect, thewireless carrier provides a policy that specifies certain data usagelimits, and bandwidth throttling parameters associated with thoselimits. When the mobile device determines that a particular data usagelimit has been exceeded, the mobile device applies the bandwidththrottling parameter associated with the exceeded limit to performoperations to slow the transmission of data to and/or from the mobiledevice.

In doing so, the burden of performing bandwidth throttling, i.e., inperforming the appropriate calculations and in carrying out theoperations used to reduce the flow of data communicated to and/or fromthe mobile device, is distributed to the mobile device itself. As such,the wireless carrier may arrange its resources to focus on improving theflow of data, without implementing internal processes that purposefullyrestrict the flow of data under certain circumstances. Furthermore, thewireless carrier may limit traffic without actively managing orimplementing the actual bandwidth throttling. By alleviating the burdenof bandwidth throttling from the wireless carrier, mobile devicemanufacturers may manufacturer and offer mobile devices that are moreadaptable and pleasing to the wireless carrier.

In general, another aspect of the subject matter described in thisspecification may be embodied in methods that include the actions ofreceiving policy from a wireless carrier that specifies one or more datausage thresholds allotted by the wireless carrier for data transferredover a wireless carrier network during a predetermined period of time,and determining an amount of data that has been transferred by themobile device over the wireless carrier network during the predeterminedperiod of time. The method also includes determining that the amountexceeds one or more of the data usage thresholds, and throttling thebandwidth of a mobile device over the wireless carrier network based ondetermining that the amount exceeds one or more of the data usagethresholds.

Other embodiments of these aspects include corresponding systems,apparatus, and computer programs, configured to perform the actions ofthe methods, encoded on computer storage devices.

These and other embodiments may each optionally include one or more ofthe following features. For instance, the method includes displaying, bythe mobile device, representations of the one or more data usagethresholds and the amount; the method includes determining, by themobile device, that the amount is within a predetermined range of one ormore of the data usage thresholds, and displaying, by the mobile device,a warning based on determining that the amount is within thepredetermined range; the method includes determining, by the mobiledevice, that the amount is trending to exceed one or more of the datausage thresholds within the predetermined period of time, anddisplaying, by the mobile device, a warning based on determining thatthe amount is trending to exceed the one or more data usage thresholds;the method includes determining, by the mobile device, a first valuerepresenting a percentage of one or more of the data usage thresholdsthat has been used by the mobile device during the predetermined periodof time, determining, by the mobile device, a second value representinga percentage of the predetermined period of time that has elapsed,determining, by the mobile device, that the first value is outside of apredetermined range from the second value, and displaying, by the mobiledevice, a warning based on determining that the first value is outsideof a predetermined range from the second value; the method includesdetermining that the first value exceeds a predetermined third value,where the warning is only displayed after determining that the firstvalue is outside of the predetermined range from the second value, andthat the first value exceeds the predetermined third value; the methodincludes determining, by the mobile device, that the predeterminedperiod of time has elapsed, and unthrottling, by the mobile device, thebandwidth of the mobile device over the wireless carrier network; thepolicy is a Fair Access Policy for the wireless carrier, and one or moreof the data usage thresholds is a bandwidth cap; the method includesreceiving, by the mobile device, an updated policy from the wirelesscarrier that specifies one or more increased data usage thresholdsallotted by the wireless carrier for data transferred over the wirelesscarrier network during the predetermined time, determining, by themobile device, that the amount does not exceed one or more of theincreased data usage thresholds, and unthrottling, by the mobile device,the bandwidth of the mobile device over the wireless carrier networkbased on determining that the amount does not exceed one or more of theincreased data usage thresholds; the method includes displaying, by themobile device, a control that allows a user of the mobile device topurchase the updated policy, and determining, by the mobile device, thatthe user has selected the control, wherein the updated policy isreceived based on determining that the user has selected the control;the method includes detecting that the mobile device has been booted,that a subscriber identity module (SIM) card associated with the mobiledevice has been changed, or that a second, different predeterminedperiod of time has elapsed, where the amount is determined based ondetecting that the mobile device has been booted, that the SIM cardassociated with the mobile device has been changed, or that the secondpredetermined period of time has elapsed; determining the amount furtherdetermining a first amount representing an amount of data that has beenused by the mobile device during the predetermined period of time whilethe mobile device is roaming, determining a second amount representingan amount of data that has been used by the mobile device during thepredetermined period of time while the mobile device is not roaming, andestablishing the second amount as the amount; determining the amountfurther includes determining a first amount representing an amount ofdata that has been communicated by the mobile device through a wide-areanetwork connection during the predetermined period of time, determininga second amount representing an amount of data that has beencommunicated by the mobile device through a local area network dataconnection during the predetermined period of time, and establishing thefirst amount as the amount; throttling the bandwidth includes delayingthe transmission of data from the mobile device; the data usagethresholds include a first data usage threshold and a second data usagethreshold, and throttling the bandwidth includes throttling thebandwidth to a first extent based on determining that the amount exceedsthe first data usage threshold, and throttling the bandwidth to asecond, different extent based on determining that the amount exceedsthe second data usage threshold; and/or the bandwidth of the mobiledevice over the wireless carrier network is throttled to a non-zero rateof data transfer.

The details of one or more implementations are set forth in theaccompanying drawings and the description below. Other potentialfeatures and advantages will become apparent from the description, thedrawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of an example system that may perform mobile devicebased bandwidth throttling.

FIG. 2 is a flow chart illustrating an example process for performingmobile device based bandwidth throttling according to a policy.

FIGS. 3, 4A-B, and 5A-B show example user interfaces for illustratingmobile device data usage.

Like reference numbers and designations in the various drawings indicatelike elements.

DETAILED DESCRIPTION

FIG. 1 is a diagram of an example system 100 that may perform mobiledevice-based bandwidth throttling. FIG. 1 also illustrates a flow ofdata, shown in states (A) to (F), as well as a user interface 120 thatmay be shown on a mobile device 102 during states (E) and (F). States(A) to (F) may occur in the illustrated sequence, or they may occur in asequence that is different than the illustrated sequence.

Briefly, the mobile device 102 receives a policy from a wireless carrier104, where the policy includes data that specifies one or more datausage thresholds allotted by the wireless carrier 104 for apredetermined period of time (e.g., a week, a day, or a billing period).As used herein, a data usage threshold refers to an amount of data(e.g., in megabits or gigabits, or in a quantity of a certain type ofdata such as songs, videos, movies, images, or other files) that themobile device 102 may send to and/or receive from the wireless carrier104. In general, data usage thresholds may be specified by the wirelesscarrier 104 or some other entity, such as an agent of the wirelesscarrier, the user, or the manufacturer or the mobile device 102.

The mobile device 102 monitors the amount of data received by and/orsent from the mobile device 102 to determine a current amount of dataused by the mobile device 102 during the predetermined period of time.If the mobile device 102 determines that the current amount of data usedexceeds one or more of the data usage thresholds, the mobile device 102throttles the bandwidth available to the mobile device 102 (e.g., to anon-zero rate of data transfer) based on the limits specified in thereceived policy.

In some implementations, the mobile device 102 displays a notificationto a user of the mobile device 102 when the mobile device 102 determinesthat the current data usage is trending to exceed one of the data usagethresholds and/or when one or more of the data usage thresholds havebeen exceeded. In throttling the bandwidth of the mobile device 102 andin providing the notification, the system 100 alerts the user of themobile device 102 that they are being penalized for transferring anexcess amount of data.

To the user's advantage, such an approach may allow a user to determinethat another user of the mobile device 102 is transferring an excessamount of data, or that the user has purchased a data plan through thewireless carrier 104 that is insufficient for the user's needs. In thesituation where the mobile device 102 itself acts as a mobile hotspot,this approach may also allow a user to determine that other devices thatare transferring data through the mobile device 102 are transferring anexcess amount of data.

In greater detail, the mobile device 102 connects to the wirelesscarrier 104 using a network 106. The wireless carrier 104 allows themobile device 102 to access data, such as a web page, an applicationstore, streaming media, or other data, and to send data, such as datarequests, online posts, file uploads, notes, text or instant messages,or other data.

The mobile device 102 may be a mobile phone, a tablet computer, a musicplayer, an e-book reader, a laptop or desktop computer, PDA, smartphone, or other handheld or mobile device that includes one or moreprocessors 108. For example, the mobile device 102 may be a desktopcomputer equipped with a Universal Serial Bus (USB) modem that providesaccess to a wireless wide area network 106 operated by the wirelesscarrier 104. The network 106 may include a wireless cellular network, awireless local area network (WLAN) or Wi-Fi™ network, a Third Generation(3G) or Fourth Generation (4G) mobile telecommunications network, alocal area network, the Internet, or any appropriate combinationthereof.

The mobile device 102 includes a throttling application 110 thatdetermines if the mobile device 102 has exceeded one or more data usagethresholds that have been allotted or specified by the wireless carrier104 for the predetermined period of time. The throttling application 110monitors the current data usage (e.g., total amount of datacommunicated, total amount of data uploaded, or total amount of datadownloaded) of the mobile device 102 for the predetermined period oftime, and compares the current data usage to one or more data usagethresholds specified in a policy received from the wireless carrier 104.

If the throttling application 110 determines that one or more of thedata usage thresholds specified in the policy has been exceeded, thethrottling application 110 triggers action, such as action by atransmission delay module 112 in the mobile device 102. The action mayinformative, such as by visually letting the user know that a data usagethreshold has been or will be exceed. Additionally, the action may beexperiential, such as by throttling the bandwidth of the mobile device102 to an extent that communication delays are perceivable to the user,as a way of notifying the user that the data usage may be out of linewith an agreed amount or norm.

In one example implementation, the transmission delay module 112 isincluded as part of the transmitter of the mobile device 102. Thetransmitter allows the mobile device 102 to communicate with thewireless carrier 104 via the network 106. For example, the transmitteris an antenna or a software module controlling the available bandwidthof an antenna in the mobile device 102. The policy received from thewireless carrier 104 may specify the extent that bandwidth should bethrottled for each data usage threshold, and the throttling application110 may provide the information specifying the bandwidth throttlingextent to the transmitter.

When triggered, the transmission delay module 112 limits the maximumbandwidth available to the mobile device 102 for the duration of thepredetermined period of time. For example, the transmission delay module112 may reduce the bandwidth from 1 Gbit/second to 100 Mbits/seconduntil the billing period has ended, or until the user purchases anupgrade data plan and a new policy is received at the mobile device 102.

During state (A), the mobile device 102 receives a policy 114 from thewireless carrier 104 that specifies one or more data usage thresholdsallotted by the wireless carrier 104 for a predetermined period of time.For example, when the mobile device 102 is initially provisioned, orwhen the mobile device 102 is powered on, the mobile device 102 requeststhe policy 114 from the wireless carrier 104. The policy 114 may beincluded in a file, such as a HyperText Markup Language (HTML) oreXtensible Markup Language (XML) file.

The policy 114 may specify thresholds that apply per mobile deviceapplication, or that apply for any or all usage of the mobile device102. If a threshold has been specified for a mobile device application,the mobile device application or applications to which the thresholdapplies can be determined by the wireless carrier, by the originalequipment manufacturer (OEM) of the mobile device 102, by the providerof the operating system of the mobile device 102, or by other parties.

The policy 114 may specify that, when the data usage exceeds 125 GB, theavailable bandwidth should be reduced to fifty percent of the maximumavailable bandwidth, and when the data usage exceeds 225 GB, theavailable bandwidth should be reduced to twenty-five percent of themaximum available bandwidth. Instead of specifying the throttling extentas a percentage, the policy 114 may specify a maximum transfer rateavailable to the mobile device for each data usage threshold. In someimplementations, the policy may only specify one data usage threshold.

The policy 114 received by the mobile device 102 may be a read onlypolicy, for example to prevent a user of the mobile device 102 fromediting the policy 114. In some implementations, a user may viewinformation from the policy 114. For example, a user interface on themobile device 102 may display information about the policy 114, such asthe beginning and end dates associated with a particular predeterminedperiod of time, the one or more data usage thresholds and associatedbandwidth throttling amounts, and current data usage amounts.

During state (B), the mobile device 102 sends and/or receives data 116at a data bandwidth rate Y. For example, the mobile device 102 requestsone or more web pages and streaming audio and video, and the wirelesscarrier 104 provides the requested data.

Periodically, the throttling application 110 determines a current amountof data that has actually been transferred to and/or from the mobiledevice 102 during the predetermined period of time. For example, thethrottling application 110 combines the amount of data received by themobile device 102 (e.g., the arrow pointing to the right of the data116) with the amount of data sent by the mobile device 102 (e.g., thearrow pointing to the left of the data 116), and adds that amount to anaccumulated amount of data that has been transferred to and/or from themobile device 102 since the period of time began, to determine thecurrent amount of data used by the mobile device 102 for thepredetermined period of time. For example, the throttling application110 determines that the current amount of data used by the mobile device102 is 200 GB.

During state (C), the throttling application 110 compares the currentamount of data that has actually been transferred to and/or from themobile device 102 during the predetermined period of time with the datausage thresholds. For example, the throttling application 110 comparesthe current amount of data (e.g., 200 GB) with the data usage thresholdof 125 GB and the data usage threshold of 225 GB.

During state (D), the throttling application 110 determines that thecurrent amount of data exceeds one or more of the data usage thresholds.For example, the throttling application 110 determines that the currentamount of data usage of 200 GB is greater than the data usage thresholdof 125 GB but is not greater than the data usage threshold of 225 GB. Ifthe current amount of data does not exceed a data usage threshold, thethrottling application 110 waits until a predetermined amount of timeelapses, and then reevaluates whether the current amount of data exceedsone or more of the data usage thresholds at the later time.

Based on the determination that a data usage threshold is exceeded, thethrottling application 110 sends a delay transmission notification 118to the transmission delay module 112 which instructs the transmitter toreduce the bandwidth available to the mobile device 102 by a rate of Z.For example, the transmission delay module may disable fourth generation(4G) services of the mobile device 102 and use third generation (3G)services to send and receive data. By using 3G services the mobiledevice 102 has less bandwidth available for data transfer than wouldotherwise be available with 4G services.

Alternatively, the transmission delay module 112 may cause packets ofdata that are to be transmitted, or packets of data that have beenreceived, to be stored for a short period of time in a buffer beforethey are further processed. When such delay becomes perceptible to auser of the mobile device 102, the user may be inconvenienced and madeaware that their data usage exceeds a certain norm, and that they shouldlimit their data usage or take some action to unthrottle the bandwidthof the mobile device, such as by purchasing an upgraded data plan.

During state (E), the mobile device 102 optionally displays a thresholdexceeded message 120 in a user interface. The threshold exceeded message120 includes text indicating that the mobile device 102 exceeded one ofthe data usage thresholds, that bandwidth is being throttled, and thecurrent bandwidth available to the mobile device 102. For example, thethreshold exceeded message 120 indicates that the mobile device 102 isno longer using 4G mobile device services for transmitting data to andfrom the mobile device 102. In some implementations, the thresholdexceeded message 120 specifies the throttled bandwidth available to themobile device 102 for the duration of the predetermined period of time,as described with more detail below in reference to FIG. 3.

During state (F), the bandwidth of the mobile device 102 is throttledbased on the limitations specified for the exceeded data usagethreshold. For example, the mobile device 102 sends and receives data122 from the wireless carrier 104 using an updated bandwidth rate ofY-Z.

The throttling of bandwidth may include delaying the transmission ofdata to and from the mobile device 102. For example, the transmission ofdata may be delayed by a millisecond, until the data may be transferredaccording to the updated bandwidth rate of Y-Z, or by some other amountof time. The transmission delay module 112 actively throttles thebandwidth of the device by slowing down the sending and receipt of data,for example by changing the behavior of the operating system kernel onthe mobile device 102. In one example implementation, the transmissiondelay module 112 alters a parameter of a driver, such as a WiFi driveror a transmitter driver, to slow the communication of data between themobile device 102 and the wireless carrier 104.

When the mobile device 102 (e.g., the throttling application 110)determines that the predefined period of time has elapsed, or that a newdata usage limit has been specified, the transmission delay module 112unthrottles the bandwidth of the mobile device. For example, when thenew billing cycle begins, when an emergency condition is detected, orwhen the user of the mobile device 102 pays for upgraded data service,the transmission delay module 112 allows use of 4G capabilities forsending and receiving data at the bandwidth rate Y, as described withreference to state (B).

In some implementations, the mobile device 102 receives a new policyperiodically, such as once a billing cycle, a week, or every day. Insome implementations, the mobile device 102 receives a new policy whenthe predetermined period of time ends or begins. In someimplementations, the mobile device 102 receives a new policy when thephone is initially turned on, provisioned, or when a SIM card is addedor changed.

In some implementations, the policy 114 is a Fair Access Policy for thewireless carrier and one or more of the data usage thresholds include abandwidth cap. For example, the Fair Access Policy implements abandwidth cap on data sent over the network 106 (e.g., a wide-areanetwork) when the network 106 is shared by multiple mobile devices inorder to ensure that a small percentage of the mobile devices do not usethe majority of the bandwidth available on the network 106.

In other implementations, the throttling application 110 determines afirst amount representing an amount of data that has actually beencommunicated by the mobile device 102 through a wide-area networkconnection (e.g., a wireless cellular network of the wireless carrier104) and a second amount representing an amount of data that hasactually been communicated by the mobile device 102 through a local areanetwork data connection (e.g., a Wi-Fi™ network) during thepredetermined period of time, and uses the first amount as the currentamount of data.

For example, the throttling application 110 determines that 65 GB ofdata has been sent and received over a wide-area network and 135 GB ofdata has been sent and received by the mobile device 102 over one ormore local area networks. The throttling application 110 then determinesthat the data threshold of 125 GB has not been exceeded because thecurrent data usage is only 65 GB.

In some implementations, the throttling application 110 may count somebut not all data that is communicated to and/or from the mobile device102 when determining the total amount of data usage. For example, indetermining the amount of data that has been sent and/or received, thethrottling application 110 may ignore the amount of data that has beensent and/or received over a certain type of connection, such as througha WiFi connection. In other implementations, the throttling application110 may ignore the amount of data that has been communicated to and/orfrom the mobile device 102 while the mobile device 102 is roaming.

In some implementations, when the throttling application 110 determinesthat one of the data usage thresholds is exceeded, the throttlingapplication 110 does not compare the current amount of data with anyremaining data usage thresholds that were not already compared with thecurrent amount of data. For example, the throttling application 110 mayrank the data usage thresholds from the highest threshold (e.g., 500 GB)to the lowest threshold (e.g., 125 GB), and compare the data usagethresholds with the current amount of data. When the throttlingapplication 110 identifies the first data usage threshold that thecurrent amount of data exceeds, the transmitter 112 reduces thebandwidth available to the mobile device according to a transfer rate Zspecified in the policy 114 and associated with the exceeded data usagethreshold.

FIG. 2 is a flow chart illustrating an example process 200 forperforming mobile device based bandwidth throttling according to apolicy. Briefly, the process 200 includes a mobile device receiving apolicy from a wireless carrier, determining the current amount of dataused during a predetermined period of time, and throttling the bandwidthof the mobile device if the current amount of data is greater than oneor more data usage thresholds specified in the policy.

In general, process 200 implements bandwidth throttling by a mobiledevice based on information that is provided by a wireless carrier. Indoing so, the burden of performing bandwidth throttling, i.e., inperforming the appropriate calculations and in carrying out theprocesses used to reduce the flow of data communicated to and from thedevice, is distributed to the mobile device itself. As such, thewireless carrier may arrange its resources to focus on improving theflow of data, without implementing internal processes that purposefullyrestrict the flow of data under certain circumstances.

In more detail, when the process 200 begins (202), the mobile devicereceives a policy from a wireless carrier (204). The policy specifiedone or more data usage thresholds allotted by the wireless carrier for apredetermined period of time. For example, the mobile device receivesthe policy from the wireless carrier that provides the mobile devicewith service and the policy includes a data usage threshold of 225 GBper billing cycle.

The mobile device determines the current usage of data for thepredetermined period of time (206). For example, the mobile devicedetermines that the amount of data sent from the mobile device combinedwith the amount of data received by the mobile device add up to 200 GBof data. In some implementations, the mobile device does not factor indata sent and received from another wireless carrier (e.g., when themobile device is roaming) in the current amount of data. In someimplementations, the mobile device does not factor in data sent andreceived over a local area network (e.g., a wireless router) in thecurrent amount of data.

The mobile device determines if the current usage is greater than one ofthe thresholds specified in the policy (208). For example, the mobiledevice compares the current amount of data to the one or more data usagethresholds specified by the policy.

If the current usage is less than all of the thresholds specified by thepolicy, the process 200 checks to see if the wireless carrier providedthe mobile device with an updated policy (204), i.e., a downgraded orupgraded policy or a newly purchased policy, and determines an updatedcurrent usage for the predetermined period of time (206). For example,the mobile device determines that the current usage of 200 GB is lessthan the threshold of 225 GB and checks to see if the wireless carrierprovided the mobile device with an updated policy.

Based on determining that the current usage is greater than one of thethresholds specified in the policy, the mobile device throttles thebandwidth available to the mobile device (210), thereby ending theprocess 200 (207). The mobile device throttles the bandwidth to a bitrate greater than zero. For example, the mobile device determines thatthe current usage is greater than the threshold of 225 GB and disables4G services, allowing the mobile device to send and receive data usingavailable 3G services at a reduced bandwidth.

The process 200 may include resetting the current usage amount andunthrottling the bandwidth available to the mobile device. In someimplementations, when the mobile device is rebooted, a subscriberidentity module (SIM) card associated with the mobile device is changed,when an emergency condition is detected, or when a second predeterminedperiod of time has elapsed (e.g., the beginning of the next billingcycle), the current amount of data usage is determined based on theidentified event change. For example, the mobile device may reset thecurrent amount of data usage to zero when a different SIM card is placedin the mobile device and unthrottle the amount of bandwidth available tothe mobile device.

The process 200 may include the mobile device receiving an updatedpolicy from the wireless carrier that specifies one or more increaseddata usage thresholds allotted by the wireless carrier for thepredetermined time. After receiving the updated policy, the mobiledevice may determine that the current amount does not exceed one or moreof the increased data usage thresholds and unthrottle the bandwidth ofthe mobile device.

Furthermore, the process 200 may include a user of the mobile devicepurchasing an updated policy from the wireless carrier. The updatedpolicy may specify one or more increased data usage thresholds allottedby the wireless carrier for the predetermined period of time. Uponreceiving the updated policy, the mobile device determines if thecurrent amount does not exceed one or more of the increased data usagethresholds and unthrottles the bandwidth of the mobile device based ondetermining that the current amount does not exceed one of the increaseddata usage thresholds.

In some implementations, the mobile device performs the process 200 atpredetermined time intervals. For example, the mobile device may performthe process 200 every ten minutes. In some implementations, the mobiledevice does not perform the process 200 if the mobile device determinesthat no data has been sent or received since the last time the process200 was performed.

FIGS. 3, 4A-B, and 5A-B show example user interfaces for illustratingmobile device data usage. The example user interfaces displayinformation about a data usage policy received from a wireless carrieron a mobile device. The example user interfaces may display the currentamount of data used, the amount of the predetermined period of time thathas passed, and allow a user to purchase an updated data usage policyfrom the wireless carrier.

FIG. 3 illustrates example user interfaces 300 a-c that displayinformation about a data usage policy. The user interface 300 a displaysa wireless and network settings menu 302 to a user. The wireless andnetwork settings menu 302 may allow a user to select the type ofnetworks a mobile device connects to (e.g., wireless carrier networks,Wi-Fi™, or Bluetooth™) in addition to other settings.

The wireless and network settings menu 302 include a mobile networksoption 304. Selection of the mobile networks option 304 displays theuser interface 300 b on the mobile device. The user interface 300 bincludes a mobile network settings menu 306 that allows a user to viewand/or modify information about data options and networks available tothe mobile device.

The mobile network settings menu 306 allows a user to view informationabout the policy received from the wireless carrier by selecting a datausage policy option 308. The data usage policy option 308 may indicatethe current amount of data used during the predetermined period of time,a data usage threshold, and information about when the predeterminedperiod of time ends.

In some implementations, the data usage policy option 308 indicates thecurrent bandwidth available to the mobile device. In someimplementations, the data usage policy option 308 indicates if thebandwidth available to the mobile device is being throttled. In someimplementations, when the policy include more than one data usagethreshold, the data usage policy option 308 indicates the next thresholdgreater than the current amount of data used. For example, if the policyincludes data usage thresholds of 125 GB and 225 GB and the currentamount of data used is 200 GB, the data usage policy option 308 mayindicate that bandwidth in being throttled, how the bandwidth is beingthrottled, and that the next threshold is 225 GB. Based on thisinformation, a user of the mobile device may determine that theavailable bandwidth will be reduced again if the current amount of dataused exceeds the next threshold of 225 GB.

User selection of the data usage policy option 308 displays the userinterface 300 c with a data usage policies menu 310 on the mobiledevice. The data usage policies menu 310 displays read only informationto a user. For example, the data usage policies menu 310 displaysinformation about a policy received from the wireless carrier and thecurrent amount of data used during the predetermined period of time.

The data usage policies menu 310 includes a current data usage panel312. The current data usage panel 312 displays representations of thecurrent amount of data used during the predetermined period of time andrepresentations of the one or more of the data usage thresholds. In someimplementations, the current data usage panel 312 displays the amount ofdata used while roaming and/or connected to a local area networkseparately from the amount of data used while connected to the networkof the wireless carrier. For example, the current data usage panel 312may indicate that the 65 GB of data was transferred using a wide areanetwork provided by the wireless carrier and 135 GB of data wastransferred while roaming or connected to a local area network.

A time frame panel 314, included in the data usage policies menu 310,displays information about the predetermined period of time. Forexample, the time frame panel 314 may indicated when the predeterminedperiod of time started, the percent of the predetermined period of timethat has elapsed, and when the current amount of data usage will bereset. A user may compare the percent of the predetermined period oftime that has elapsed with a percent of the data usage threshold thathas been used (e.g., displayed in the current data usage panel 312) todetermine if the percentages are about the same or if the user may needto purchase an updated policy with increased data usage thresholds.

A data rate policy panel 316 displays information about the currentbandwidth available to the mobile device and/or the bandwidth that willbe available when a data usage threshold is exceeded. For example, thedata rate policy panel 316 indicates that the data rate will be 300KB/second when the current amount of data usage exceeds 225 GB.

Selection of a learn more option 318 may display additional informationabout data policies on the mobile device. For example, selection of thelearn more option 318 may open a web browser on the mobile device anddirect the web browser to a page associated with the wireless carrierand additional information about the wireless carrier's data usagepolicies.

In some implementations, selection of the learn more option 318 maydisplay a control to a user of the mobile device that allows the user topurchase an updated policy. The mobile device may determine when theuser selects the control, provide information associated with thecontrol selection to the wireless carrier, and receive an updated policyfrom the wireless carrier. For example, the control may display a listof policies with increased or decreased data usage thresholds and allowthe user to select one of the policies. The selection of an updatedpolicy may include selection of a duration for the updated policy. Forexample, the updated policy may be for the predetermined period of timeor until the user of the mobile device purchases another policy.

FIGS. 4A-B illustrate example user interfaces 400 a-b that displayinformation about a data usage warning notification. The user interface400 a includes a status bar 402 that displays status information aboutthe mobile device. For example, the status bar may indicate the currenttime, the remaining battery life of the mobile device, networks themobile device is connected to, and calendar and email notifications.

The status bar 402 includes a data usage warning notification 404 thatindicates that the mobile device currently has high data usage.Selection of the data usage warning notification 404 may display theuser interface 400 b on the mobile device.

The user interface 400 b includes an ongoing status panel 406 and anotifications panel 408. The ongoing status panel 406 includesinformation about the current status of the mobile device, such as thatthe mobile device is current connected to a computer.

The notifications panel 408 includes a high data usage option 410. Thehigh data usage option 410 displays information about a data usagethreshold that the mobile device may exceed, such as the date and timethat the determination was made that the mobile device may exceed thedata usage threshold.

Selection of the high data usage option 410 displays additionalinformation about the current data usage and one or more data usagethresholds (e.g., the data usage threshold that the mobile device mayexceed). For example, when the mobile device determines that a userselected the high data usage option 410, the mobile device may displaythe user interface 300 c.

In some implementations, the data usage warning notification 404 isremoved from the status bar 402 when the high data usage option 410 isselected. For example, when the user interface 300 c is displayed by themobile device, the mobile device does not display the data usage warningnotification 404 again until the mobile device determines that anotherdata usage threshold may be exceeded or after the predetermined periodof time ends. In some implementations, when the user interface 400 b isdisplayed on the mobile device, the data usage warning notification 404is removed from the status bar 402.

In some implementations, the mobile device determines that the currentamount is within a predetermined range of one or more of the data usagethresholds and displays the data usage warning notification 404 on thestatus bar 402. For example, the mobile device may determine that thecurrent amount of data used (e.g., 200 GB) is within twenty-five percentof a data usage threshold (e.g., 225 GB) and display the data usagewarning notification 404 on the mobile device.

In other implementations, when the mobile device determines that thecurrent amount of data usage is trending to exceed one or more of thedata usage thresholds within the predetermined period of time, themobile device displays a warning in a user interface of the mobiledevice. The determination that a mobile device is trending to exceed adata usage threshold may take into account certain ‘tolerances,’ thatvary over the predetermined period, i.e., to get smaller and smaller asthe billing cycle or usage period elapses.

In one example, the mobile device may store data usage values that werecalculated as current values, at different times during the a billing orusage period. The data usage values may be expressed as a percentage ofa data usage threshold or of a maximum data usage value, or as actualdata usage amounts. The mobile device may also store the associatedtimes when the each data usage values was calculated. Using the storeddata usage values, the mobile device may determine whether one or moreof the data usage values suggests that a data usage threshold will beexceeded.

In one implementation, the mobile device may calculate an acceptabledata usage amount that may be used per unit time without exceeding adata usage threshold, by dividing a data usage threshold by a quantityof units of time, for example, by a total number of days in a billingcycle or usage period. The result of this calculation may be multipliedby the quantity of units of time, i.e., number of days, that haveelapsed since the predetermined period of time began.

The resulting value represents the maximum data usage amount that shouldhave been used at that point in the predetermined period of time, toavoid trending over the data usage threshold. If the actual data usageamount exceeds that resulting value, the mobile device may display anotification.

Alternatively, the resulting value may be adjusted upwards or downwardsby a fixed amount, i.e., 1%, 5%, 10%, or 25%, to avoid unnecessary“false positive” notifications, or to notify the user of the mobiledevice before the trend to exceed the data usage threshold isestablished. Under this approach, the mobile device may only displaynotifications if the actual data usage amount exceeds the resultingvalue by the fixed amount.

Alternatively, the resulting value may be adjusted by a variable amount,to avoid notifying users when the actual data usage amount is trendingto exceed a data usage threshold during an early portion of thepredetermined period of time. For instance, the mobile device may onlydisplay notifications if the actual data usage amount exceeds theresulting value by a larger amount, i.e. 15% or 25%, during the firstfew days of a data usage period, but may display notifications if theactual data usage amount exceeds the resulting value by a smalleramount, i.e., 0%, 1%, or 5%, during the last few days of the data usageperiod. Under this approach, if the actual data usage amount exceeds theresulting value by a smaller amount during the first few days of a datausage period, no notification is shown.

When the mobile device determines that the percentage of one or more ofthe data usage thresholds that has actually been used by the mobiledevice during the predetermined period of time is outside of apredetermined range from the percentage of the predetermined period oftime that has elapsed, the mobile device displays a warning in a userinterface. For example, the mobile device may determine that fiftypercent of the predetermined period of time has elapsed and that themobile device has used eighty-nine percent of the data specified by adata usage threshold. Based on the percent of the data usage thresholdused and the percent of time elapsed, the mobile device determines thatthe percentage of the data usage threshold used is greater than thepercentage of time elapsed by more than ten percent and displays thedata usage warning notification 404 in the user interface 400 a.

In some implementations, the mobile device displays the warning when thepercentage of the data usage threshold used exceeds a predeterminedpercentage value and is outside of the predetermined range. For example,the mobile device does not display the data usage warning notification404 until the percentage of the data usage threshold used exceedstwenty-five percent. If the mobile device determines that the percentageof the data usage threshold used is sixteen percent and the percentageof time elapsed is five percent, then the mobile device does not displaythe warning.

When the percentage of the data usage threshold used is greater thantwenty-five percent (e.g., twenty-six percent), if the range between thepercentage of the data usage threshold used and the percentage of timeelapsed is outside of the predetermined range, then the mobile devicedisplays the data usage warning notification 404 in the user interface400 a. Delaying display of the data usage warning notification 404 untilthe percentage of the data usage threshold used is greater than thepredetermined percentage value may avoid display of premature warningson the mobile device.

In some implementations, the mobile device does not display the warninguntil the percentage of time elapsed is greater than a predeterminedpercentage value. For example, the mobile device does not display thedata usage warning notification 404 until thirty percent of thepredetermined period of time has elapsed.

FIGS. 5A-B illustrate example user interfaces 500 a-b that displayinformation about a data usage threshold exceeded notification. In someimplementations, the user interface 500 a is displayed on the mobiledevice after the mobile device displays the user interface 400 a. Forexample, the mobile device displays the data usage warning notification404 before displaying a data usage threshold exceeded notification.

The user interface 500 a includes a status bar 502 which displaysinformation about the current status of the mobile device. The statusbar 502 includes a data usage threshold exceeded notification 504. Forexample, when the mobile device determines that the current data usageis greater than one or more of data usage thresholds specified by apolicy, the mobile device displays the data usage threshold exceedednotification 504.

Selection of the data usage threshold exceeded notification 504 maydisplay the user interface 500 b on the mobile device. The userinterface 500 b includes an ongoing status panel 506 that presents anexceeded data usage limit option 508. The exceeded data usage limitoption 508 may display information about the data threshold that hasbeen exceeded on the mobile device. In some implementations, selectionof the exceeded data usage limit option 508 will display a userinterface, such as the user interface 300 c, with additional informationabout the data usage threshold that has been exceeded.

In some implementations, the data usage threshold exceeded notification504 is displayed on the mobile device until the mobile device receives anew policy (e.g., with increased data usage thresholds) or until thepredetermined period of time ends. For example, the data usage thresholdexceeded notification 504 is displayed on the mobile device until a newbilling cycle starts.

In some implementations, when the network the mobile device is connectedto changes, the data usage threshold exceeded notification 504 isremoved from the status bar 502. For example, when the mobile deviceconnects to a local area network or begins to roam and the mobile deviceis no longer throttling bandwidth, the data usage threshold exceedednotification 504 is removed from the status bar 502. If the mobiledevice connects to the wireless carrier's wide area network again duringthe same predetermined period of time, the data usage threshold exceedednotification 504 is displayed in the status bar 502 again.

When the policy received by the mobile device includes more than onedata usage threshold (e.g., a first and a second data usage threshold),the mobile device may throttle bandwidth based on the data usagethreshold exceeded. For example, the mobile device may throttle thebandwidth to a first extent when the current amount of data usageexceeds the first data usage threshold and throttle the bandwidth to asecond, different extent based on determining that the current amount ofdata usage exceeds the second data usage threshold.

For example, the mobile device may limit the bandwidth to fifty percentof maximum unthrottled bandwidth available to the mobile device when alower data usage threshold (e.g., 125 GB) is exceeded, and limit thebandwidth to twenty-five percent of the maximum unthrottled bandwidthavailable to the mobile device when a higher data usage threshold (e.g.,225 GB) is exceeded.

In some implementations, the status bar 502 indicates how the bandwidthis being throttled. For example, if the fastest connection available tothe mobile device is 4G transfer rates, when the bandwidth of the mobiledevice is throttled to 3G transfer rates, the mobile device may displaya 3G status icon in the status bar 502. In some implementations, thedata bandwidth status icon (e.g., the 3G status icon) is displayedwhenever the data usage threshold exceeded notification 504 is displayedin the status bar 502.

A number of implementations have been described. Nevertheless, it willbe understood that various modifications may be made without departingfrom the spirit and scope of the disclosure. For example, various formsof the flows shown above may be used, with steps re-ordered, added, orremoved. Accordingly, other implementations are within the scope of thefollowing claims.

Implementations and all of the functional operations described in thisspecification may be implemented in digital electronic circuitry, or incomputer software, firmware, or hardware, including the structuresdisclosed in this specification and their structural equivalents, or incombinations of one or more of them. Implementations may be implementedas one or more computer program products, i.e., one or more modules ofcomputer program instructions encoded on a computer readable medium forexecution by, or to control the operation of, data processing apparatus.The computer readable medium may be a machine-readable storage device, amachine-readable storage substrate, a memory device, a composition ofmatter effecting a machine-readable propagated signal, or a combinationof one or more of them. The term “data processing apparatus” encompassesall apparatus, devices, and machines for processing data, including byway of example a programmable processor, a computer, or multipleprocessors or computers. The apparatus may include, in addition tohardware, code that creates an execution environment for the computerprogram in question, e.g., code that constitutes processor firmware, aprotocol stack, a database management system, an operating system, or acombination of one or more of them. A propagated signal is anartificially generated signal, e.g., a machine-generated electrical,optical, or electromagnetic signal that is generated to encodeinformation for transmission to suitable receiver apparatus.

A computer program (also known as a program, software, softwareapplication, script, or code) may be written in any form of programminglanguage, including compiled or interpreted languages, and it may bedeployed in any form, including as a stand alone program or as a module,component, subroutine, or other unit suitable for use in a computingenvironment. A computer program does not necessarily correspond to afile in a file system. A program may be stored in a portion of a filethat holds other programs or data (e.g., one or more scripts stored in amarkup language document), in a single file dedicated to the program inquestion, or in multiple coordinated files (e.g., files that store oneor more modules, sub programs, or portions of code). A computer programmay be deployed to be executed on one computer or on multiple computersthat are located at one site or distributed across multiple sites andinterconnected by a communication network.

The processes and logic flows described in this specification may beperformed by one or more programmable processors executing one or morecomputer programs to perform functions by operating on input data andgenerating output. The processes and logic flows may also be performedby, and apparatus may also be implemented as, special purpose logiccircuitry, e.g., an FPGA (field programmable gate array) or an ASIC(application specific integrated circuit).

Processors suitable for the execution of a computer program include, byway of example, both general and special purpose microprocessors, andany one or more processors of any kind of digital computer. Generally, aprocessor will receive instructions and data from a read only memory ora random access memory or both. The essential elements of a computer area processor for performing instructions and one or more memory devicesfor storing instructions and data. Generally, a computer will alsoinclude, or be operatively coupled to receive data from or transfer datato, or both, one or more mass storage devices for storing data, e.g.,magnetic, magneto optical disks, or optical disks. However, a computerneed not have such devices. Moreover, a computer may be embedded inanother device, e.g., a tablet computer, a mobile telephone, a personaldigital assistant (PDA), a mobile audio player, a Global PositioningSystem (GPS) receiver, to name just a few. Computer readable mediasuitable for storing computer program instructions and data include allforms of non volatile memory, media and memory devices, including by wayof example semiconductor memory devices, e.g., EPROM, EEPROM, and flashmemory devices; magnetic disks, e.g., internal hard disks or removabledisks; magneto optical disks; and CD ROM and DVD-ROM disks. Theprocessor and the memory may be supplemented by, or incorporated in,special purpose logic circuitry.

To provide for interaction with a user, processes may be implemented ona computer having a display device, e.g., a CRT (cathode ray tube) orLCD (liquid crystal display) monitor, for displaying information to theuser and a keyboard and a pointing device, e.g., a mouse or a trackball,by which the user may provide input to the computer. Other kinds ofdevices may be used to provide for interaction with a user as well; forexample, feedback provided to the user may be any form of sensoryfeedback, e.g., visual feedback, auditory feedback, or tactile feedback;and input from the user may be received in any form, including acoustic,speech, or tactile input.

Processes may be implemented in a computing system that includes a backend component, e.g., as a data server, or that includes a middlewarecomponent, e.g., an application server, or that includes a front endcomponent, e.g., a client computer having a graphical user interface ora Web browser through which a user may interact with any implementation,or any combination of one or more such back end, middleware, or frontend components. The components of the system may be interconnected byany form or medium of digital data communication, e.g., a communicationnetwork. Examples of communication networks include a local area network(“LAN”) and a wide area network (“WAN”), e.g., the Internet.

The computing system may include clients and servers. A client andserver are generally remote from each other and typically interactthrough a communication network. The relationship of client and serverarises by virtue of computer programs running on the respectivecomputers and having a client-server relationship to each other.

While this specification contains many specifics, these should not beconstrued as limitations on scope or of what may be claimed, but ratheras descriptions of features specific to particular implementations.Certain features that are described in this specification in the contextof separate implementations may also be implemented in combination in asingle embodiment. Conversely, various features that are described inthe context of a single embodiment may also be implemented in multipleembodiments separately or in any suitable subcombination. Moreover,although features may be described above as acting in certaincombinations and even initially claimed as such, one or more featuresfrom a claimed combination may in some cases be excised from thecombination, and the claimed combination may be directed to asubcombination or variation of a subcombination.

Similarly, while operations are depicted in the drawings in a particularorder, this should not be understood as requiring that such operationsbe performed in the particular order shown or in sequential order, orthat all illustrated operations be performed, to achieve desirableresults. In certain circumstances, multitasking and parallel processingmay be advantageous. Moreover, the separation of various systemcomponents in the implementations described above should not beunderstood as requiring such separation in all implementations, and itshould be understood that the described program components and systemsmay generally be integrated together in a single software product orpackaged into multiple software products.

In each instance where an HTML file is mentioned, other file types orformats may be substituted. For instance, an HTML file may be replacedby an XML, JSON, plain text, or other types of files. Moreover, where atable or hash table is mentioned, other data structures (such asspreadsheets, relational databases, or structured files) may be used.

Particular implementations have been described. Other implementationsare within the scope of the following claims. For example, the stepsrecited in the claims may be performed in a different order and stillachieve desirable results.

What is claimed is:
 1. A computer-readable storage device encoded with acomputer program, the program comprising instructions that if executedby one or more computers cause the one or more computers to performoperations comprising: receiving a policy from a wireless carrier,wherein the policy specifies a data usage threshold allotted by thewireless carrier for data transferred over a wireless carrier networkduring a predetermined period of time; determining an amount of datathat has been transferred by the mobile device over the wireless carriernetwork at a particular time during the predetermined period of time;determining a prorated amount of the data usage threshold correspondingto the particular time during the predetermined period of time;selecting a non-zero, minimum notification amount; determining that theamount of data that has been transferred by the mobile device over thewireless carrier network at the particular time during the predeterminedperiod of time exceeds the prorated amount of the data usage thresholdcorresponding to the particular time by the minimum notification amount;and providing a notification that the bandwidth of the mobile devicewill be throttled, based on determining that the amount of data that hasbeen transferred by the mobile device over the wireless carrier networkat the particular time during the predetermined period of time exceedsthe prorated amount of the data usage threshold corresponding to theparticular time by the minimum notification amount.
 2. The device ofclaim 1, wherein the operations comprise displaying representations ofthe amount and the data usage threshold.
 3. The device of claim 1,wherein the policy comprises a Fair Access Policy for the wirelesscarrier.
 4. The device of claim 1, wherein the operations comprise:providing a control for display that allows a user of the mobile deviceto purchase an updated policy; determining that the user has selectedthe control; and receiving the updated policy based on determining thatthe user has selected the control.
 5. The device of claim 1, wherein theoperations comprise: throttling the bandwidth of the mobile device overthe wireless carrier network based on determining that the amount ofdata that has been transferred by the mobile device over the wirelesscarrier network at the particular time during the predetermined periodof time exceeds the prorated amount of the data usage thresholdcorresponding to the particular time by the minimum notification amount.6. The device of claim 1, wherein the policy specifies a maximum datatransfer rate available to the mobile device associated with the datausage threshold.
 7. The device of claim 1, wherein the operationscomprise: determining that the predetermined period of time has elapsed;and resetting the amount of data that has been transferred by the mobiledevice over the wireless carrier network based on determining that thepredetermined period of time has elapsed.
 8. A computer-implementedmethod comprising: receiving a policy from a wireless carrier, whereinthe policy specifies a data usage threshold allotted by the wirelesscarrier for data transferred over a wireless carrier network during apredetermined period of time; determining an amount of data that hasbeen transferred by the mobile device over the wireless carrier networkat a particular time during the predetermined period of time;determining a prorated amount of the data usage threshold correspondingto the particular time during the predetermined period of time;selecting a non-zero, minimum notification amount; determining that theamount of data that has been transferred by the mobile device over thewireless carrier network at the particular time during the predeterminedperiod of time exceeds the prorated amount of the data usage thresholdcorresponding to the particular time by the minimum notification amount;and providing a notification that the bandwidth of the mobile devicewill be throttled, based on determining that the amount of data that hasbeen transferred by the mobile device over the wireless carrier networkat the particular time during the predetermined period of time exceedsthe prorated amount of the data usage threshold corresponding to theparticular time by the minimum notification amount.
 9. The method ofclaim 8, comprising displaying representations of the amount and thedata usage threshold.
 10. The method of claim 8, wherein the policycomprises a Fair Access Policy for the wireless carrier.
 11. The methodof claim 8, comprising: providing a control for display that allows auser of the mobile device to purchase an updated policy; determiningthat the user has selected the control; and receiving the updated policybased on determining that the user has selected the control.
 12. Thedevice of claim 8, further comprising throttling the bandwidth of themobile device over the wireless carrier network based on determiningthat the amount of data that has been transferred by the mobile deviceover the wireless carrier network at the particular time during thepredetermined period of time exceeds the prorated amount of the datausage threshold corresponding to the particular time by the minimumnotification amount.
 13. The device of claim 8, wherein the policyspecifies a maximum data transfer rate available to the mobile deviceassociated with the data usage threshold.
 14. The device of claim 8,comprising: determining that the predetermined period of time haselapsed; and resetting the amount of data that has been transferred bythe mobile device over the wireless carrier network based on determiningthat the predetermined period of time has elapsed.
 15. A systemcomprising: one or more processors; and a computer-readable mediumcoupled to the one or more processors having instructions stored thereonwhich, if executed by the one or more processors, cause the system toperform operations comprising: receiving a policy from a wirelesscarrier, wherein the policy specifies a data usage threshold allotted bythe wireless carrier for data transferred over a wireless carriernetwork during a predetermined period of time; determining an amount ofdata that has been transferred by the mobile device over the wirelesscarrier network at a particular time during the predetermined period oftime; determining a prorated amount of the data usage thresholdcorresponding to the particular time during the predetermined period oftime selecting a non-zero, minimum notification amount; determining thatthe amount of data that has been transferred by the mobile device overthe wireless carrier network at the particular time during thepredetermined period of time exceeds the prorated amount of the datausage threshold corresponding to the particular time by the minimumnotification amount; and providing a notification that the bandwidth ofthe mobile device will be throttled, based on determining that theamount of data that has been transferred by the mobile device over thewireless carrier network at the particular time during the predeterminedperiod of time exceeds the prorated amount of the data usage thresholdcorresponding to the particular time by the minimum notification amount.16. The system of claim 15, wherein the operations comprise displayingrepresentations of the amount and the data usage threshold.
 17. Thesystem of claim 15, wherein the policy comprises a Fair Access Policyfor the wireless carrier.
 18. The system of claim 15, wherein theoperations comprise: throttling the bandwidth of the mobile device overthe wireless carrier network based on determining that the amount ofdata that has been transferred by the mobile device over the wirelesscarrier network at the particular time during the predetermined periodof time exceeds the prorated amount of the data usage thresholdcorresponding to the particular time by the minimum notification amount.19. The system of claim 15, wherein the policy specifies a maximum datatransfer rate available to the mobile device associated with the datausage threshold.
 20. The system of claim 15, wherein the operationscomprise: determining that the predetermined period of time has elapsed;and resetting the amount of data that has been transferred by the mobiledevice over the wireless carrier network based on determining that thepredetermined period of time has elapsed.